„Deep within every human being there still lives the anxiety over the possibility of being alone in the world“

— Søren Kierkegaard, Context: Deep within every human being there still lives the anxiety over the possibility of being alone in the world, forgotten by God, overlooked among the millions and millions in this enormous household. One keeps this anxiety at a distance by looking at the many round about who are related to him as kin and friends, but the anxiety is still there, nevertheless, and one hardly dares think of how he would feel if all this were taken away.
Journals VII 1A 363

— Pierre Teilhard De Chardin French philosopher and Jesuit priest 1881 - 1955This is attributed to Pierre Teilhard de Chardin in The Joy of Kindness (1993), by Robert J. Furey, p. 138; but it is attributed to G. I. Gurdjieff in Beyond Prophecies and Predictions: Everyone's Guide To The Coming Changes (1993) by Moira Timms, p. 62; neither cite a source. It was widely popularized by Wayne Dyer, who often quotes it in his presentations, crediting it to Chardin, as does Stephen Covey in Living the 7 Habits : Stories of Courage and Inspiration (2000), p. 47
I spent a lot of time looking for this quote in all of Chardin' books and did not find it. That is the problem with the Internet, people simply copy and paste, therefore, it is our responsibility to keep an eye on errors of this kind. Be always careful to verify quotations that do not show a source (book/magazine, and page number, etc.)
Variant: We are not human beings on a spiritual journey. We are spiritual beings on a human journey.
The above "quotation" can be considered a paraphrase of Hegel's dictum that matter is spirit fallen into a state of self-otherness.